Re: Round Rect
Re: Round Rect
- Subject: Re: Round Rect
- From: Greg Herlihy <email@hidden>
- Date: Wed, 29 Mar 2006 22:06:36 -0800
- Thread-topic: Round Rect
Round corners are elliptical - because a circle is an ellipse (just as a
square is a rectangle). So technically, yes, the corners of a QuickDraw
RoundRect were drawn with ellipses - but those ellipsis were always circles.
And in fact the sample code posted shows as much since it calls
appendBezierPathWithArcWithCenter - a method whose curves are always
circular.
At any rate, here is a link to Apple's Core Graphics recipe for drawing
round rectangles. Most of the CG routines have Cocoa analogs, so it would be
pretty straightforward to adapt this code for Cocoa:
http://developer.apple.com/documentation/Carbon/Conceptual/QuickDrawToQuartz
2D/tq_other/chapter_3_section_6.html#//apple_ref/doc/uid/TP40001098-CH220-Do
ntLinkElementID_18
Greg
On 3/29/06 7:17 PM, "Henry McGilton" <email@hidden> wrote:
>
>
> On Mar 29, 2006, at 5:51 PM, Gregory Weston wrote:
>
>> John C. Randolph wrote:
>>
>>> On Mar 29, 2006, at 6:00 AM, Valerio Ferrucci wrote:
>>>
>>>> how can I draw a round rect in cocoa?
>>>
>>> From the list archives:
>>>
>>> http://lists.apple.com/archives/Cocoa-dev/2001/Aug/msg01710.html
>>
>> The traditional Mac OS RoundRect has elliptical corners,
>> though, rather than circular. Here's the implementation I use.
>
> Well, I was following this thread in a desultory fashion until
> your statement about traditional RoundRect has elliptical corners
> caught my eye.
>
> (1) Is that true even for 'rectangles' that are actually square?
>
> (2) Do the x and y radii of the ellipse vary with the width and
> height of the rectangle?
>
> If the answers to (1) and (2) are affirmative, perhaps another
> approach is to draw a unit path and scale it with an
> appropriate affine transform . . .
>
> Cheers,
> ........ Henry
>
>
>
> ===============================+============================
> Henry McGilton, Boulevardier | Trilithon Software
> Objective-C/Java Composer | Seroia Research
> -------------------------------+----------------------------
> mailto:email@hidden | http://www.trilithon.com
> |
> ===============================+============================
>
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